| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique for producing a grain-oriented magnetic steel sheet excellent in coating film properties. <P>SOLUTION: When the grain-oriented magnetic steel sheet is produced by hot-rolling a steel slab containing, by mass, 0.02-0.10% C, 2.0-4.0% Si, 0.002-0.2% Cu and 0.01-0.08% one or both kinds of S and Se, carrying out annealing of the hot-rolled steel sheet, cold-rolling the steel sheet at two or more times including the intermediate annealing, and decarburizing-annealing and finish-annealing the steel sheet, PH<SB>2</SB>O/PH<SB>2</SB>in the heating zone at the intermediate annealing before the final cold-rolling is controlled to 0.01-0.2, a soaking zone is made a non-oxidizing atmosphere and further, when necessary, pickling and/or grinding are performed. Then, the desiliconized depth of the steel sheet surface before the final cold-rolling is made deeper than X(μm) obtained from following formula: X(μm)=61.7[Cu]<SP>2</SP>-23.5[Cu]+3.2 (wherein, [Cu] is Cu content (mass%) in base iron) and basis weight of oxigen on the steel sheet surface is adjusted to ≤0.6g/m<SP>2</SP>per both surfaces. <P>COPYRIGHT: (C)2011,JPO&INPIT |
